<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>手风琴效果</title>
</head>
<style>
* {
  margin: 0px;
  padding: 0px;
}

body{
    background-color: #ec817d;
}
/* 公共CSS部分 */
.container {
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: center;
  margin: 200px auto;
  width: 200px;
}
.btn {
  color: #fff;
  cursor: pointer;
  font-size: 16px;
  font-weight: 400;
  line-height: 45px;
  margin: 0 0 2em;
  max-width: 160px;
  position: relative;
  text-decoration: none;
  text-transform: uppercase;
  width: 100%;
}
/* 第一个按钮CSS样式 */
.btn-1 {
  background: #e02c26;
  font-weight: 100;
}
.btn-1 svg {
  height: 45px;
  left: 0;
  position: absolute;
  top: 0;
  width: 100%;
}
.btn-1 rect {
  fill: none;
  stroke: #fff;
  stroke-width: 2;
  stroke-dasharray: 422, 0;
  transition: all 0.35s linear;
}
.btn-1:hover {
  background: rgba(225, 51, 45, 0);
  font-weight: 900;
  letter-spacing: 1px;
}
.btn-1:hover rect {
  stroke-width: 5;
  stroke-dasharray: 15, 310;
  stroke-dashoffset: 48;
  transition: all 1.35s cubic-bezier(0.19, 1, 0.22, 1);
}


/* 第二个按钮CSS样式 */
.btn-2 {
  letter-spacing: 0;
}
.btn-2:hover,
.btn-2:active {
  letter-spacing: 5px;
}
.btn-2:after,
.btn-2:before {
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
  border: 1px solid rgba(255, 255, 255, 0);
  bottom: 0px;
  content: " ";
  display: block;
  margin: 0 auto;
  position: relative;
  transition: all 280ms ease-in-out;
  width: 0;
}
.btn-2:hover:after,
.btn-2:hover:before {
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
  border-color: #fff;
  transition: width 350ms ease-in-out;
  width: 70%;
}
.btn-2:hover:before {
  bottom: auto;
  top: 0;
  width: 70%;
}


/* 第三个按钮CSS样式 */
.btn-3 {
  background: #e3403a;
  border: 1px solid #da251f;
  box-shadow: 0px 2px 0 #d6251f, 2px 4px 6px #e02a24;
  font-weight: 900;
  letter-spacing: 1px;
  transition: all 150ms linear;
}

.btn-3:hover {
  background: #e02c26;
  border: 1px solid rgba(0, 0, 0, 0.05);
  box-shadow: 1px 1px 2px rgba(255, 255, 255, 0.2);
  color: #ec817d;
  text-decoration: none;
  text-shadow: -1px -1px 0 #c2211c;
  transition: all 250ms linear;
}

/* 第四个按钮CSS样式 */
.btn-4 {
  border: 1px solid;
  overflow: hidden;
  position: relative;
}
.btn-4 span {
  z-index: 20;
}
.btn-4:after {
  background: #fff;
  content: "";
  height: 155px;
  left: -75px;
  opacity: 0.2;
  position: absolute;
  top: -50px;
  transform: rotate(35deg);
  transition: all 550ms cubic-bezier(0.19, 1, 0.22, 1);
  width: 50px;
  z-index: -10;
}

.btn-4:hover:after {
  left: 120%;
  transition: all 550ms cubic-bezier(0.19, 1, 0.22, 1);
}


/* 第五个按钮CSS样式 */
.btn-5 {
  border: 0 solid;
  box-shadow: inset 0 0 20px rgba(255, 255, 255, 0);
  outline: 1px solid;
  outline-color: rgba(255, 255, 255, 0.5);
  outline-offset: 0px;
  text-shadow: none;
  transition: all 1250ms cubic-bezier(0.19, 1, 0.22, 1);
}

.btn-5:hover {
  border: 1px solid;
  box-shadow: inset 0 0 20px rgba(255, 255, 255, 0.5), 
  0 0 20px rgba(255, 255, 255, 0.2);
  outline-color: rgba(255, 255, 255, 0);
  outline-offset: 15px;
  text-shadow: 1px 1px 2px #427388;
}
</style>
<body>
    <div class="container">
        <!-- 第一个按钮html代码布局 -->
        <a href="#" class="btn btn-1">
          <svg>
            <rect x="0" y="0" fill="none" width="100%" height="100%"/>
          </svg>
         前端学习
        </a>
        <!-- 第二个按钮html代码布局 -->
        <a href="#" class="btn btn-2">PHP学习</a> 
        <!-- 第三个按钮html代码布局 -->
        <a href="#" class="btn btn-3">VUE学习</a> 
        <!-- 第四个按钮html代码布局 -->
        <a href="#" class="btn btn-4"><span>Golang学习</span></a> 
        <!-- 第五个按钮html代码布局 -->
        <a href="#" class="btn btn-5">软考课程</a> 
      </div>
</body>
</html>